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"Deck the Halls" is a traditional Yuletide and New Years' carol. The tune is Welsh dating back to the sixteenth century, and belongs to a winter carol, "Nos Galan". In the eighteenth century Wolfgang Amadeus Mozart used the tune to "Deck the Halls" for a violin and piano duet. The repeated "fa la la" is from medieval ballads and used in "Nos Galan", the remaining lyrics are American in origin dating from the nineteenth century.